package com.wl.operator;
/**
 * @author wanglei
 */
public class Demo4 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        //1020 变成字符串拼接
        System.out.println(""+a+b);
        //30 变成数字，再变成字符串
        System.out.println(a+b+"");
    }
}
